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EGR Boost Sensor (Except Miata)

NOTE: Do not apply vacuum beyond specification. Will damage EGR boost sensor.
NOTE: Millenia 2.3L is not equipped with an EGR Boost Sensor
  1. Disconnect PCM harness connector and install 104-Pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . Turn ignition switch on. Disconnect vacuum hose from between EGR boost sensor and EGR boost sensor solenoid valve. Connect vacuum pump to EGR boost sensor port. Ensure PCM terminal No. 34 (terminal 3F on Millenia) voltage is 2.3-4.7 volts. Apply 7.85 in. Hg (0-24.0 in. Hg on Millenia) to EGR boost sensor and verify PCM terminal No. 34 (terminal 3F on Millenia) voltage drops to 0.8-1.3 volts.
  2. If EGR boost sensor voltage is not as specified, locate and repair open or short circuit in wire harness between EGR boost sensor and PCM. See Fig 1 . See WIRING DIAGRAMS article. If voltage reading does not change as specified when vacuum is applied, replace EGR boost sensor.
Fig 1: Identifying Boost Sensor Terminals
G97G07735Courtesy of MAZDA MOTORS CORP.
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